Ramsey Theory : : Unsolved Problems and Results / / Xiaodong Xu, Meilian Liang, Haipeng Luo.

Key problems and conjectures have played an important role in promoting the development of Ramsey theory, a field where great progress has been made during the past two decades, with some old problems solved and many new problems proposed. The present book will be helpful to readers who wish to lear...

Full description

Saved in:
Bibliographic Details
Superior document:Title is part of eBook package: De Gruyter DG Plus eBook-Package 2018
VerfasserIn:
TeilnehmendeR:
MitwirkendeR:
Place / Publishing House:Berlin ;, Boston : : De Gruyter, , [2018]
©2018
Year of Publication:2018
Language:English
Online Access:
Physical Description:1 online resource (XII, 178 p.)
Tags: Add Tag
No Tags, Be the first to tag this record!
id 9783110576702
lccn 2018016483
ctrlnum (DE-B1597)489710
(OCoLC)1048948547
collection bib_alma
record_format marc
spelling Xu, Xiaodong, author. aut http://id.loc.gov/vocabulary/relators/aut
Ramsey Theory : Unsolved Problems and Results / Xiaodong Xu, Meilian Liang, Haipeng Luo.
Berlin ; Boston : De Gruyter, [2018]
©2018
1 online resource (XII, 178 p.)
text txt rdacontent
computer c rdamedia
online resource cr rdacarrier
text file PDF rda
Frontmatter -- Preface -- Contents -- 1. Some Definitions And Notations -- 2. Ramsey Theory -- 3. Bi-Color Diagonal Classical Ramsey Numbers -- 4. Paley Graphs And Lower Bounds For R(K, K) -- 5. Bi-Color Off-Diagonal Classical Ramsey Numbers -- 6. Multicolor Classical Ramsey Numbers -- 7. Generalized Ramsey Numbers -- 8. Folkman Numbers -- 9. The Erdős–Hajnal Conjecture -- 10. Other Ramsey-Type Problems In Graph Theory -- 11. On Van Der Waerden Numbers And Szemerédi’S Theorem -- 12. More Problems Of Ramsey Type In Additive Number Theory -- 13. Sidon–Ramsey Numbers -- 14. Games In Ramsey Theory -- 15. Local Ramsey Theory -- 16. Set-Coloring Ramsey Theory -- 17. Other Problems And Conjectures -- Epilogue -- Bibliography -- Index
restricted access http://purl.org/coar/access_right/c_16ec online access with authorization star
Key problems and conjectures have played an important role in promoting the development of Ramsey theory, a field where great progress has been made during the past two decades, with some old problems solved and many new problems proposed. The present book will be helpful to readers who wish to learn about interesting problems in Ramsey theory, to see how they are interconnected, and then to study them in depth. This book is the first problem book of such scope in Ramsey theory. Many unsolved problems, conjectures and related partial results in Ramsey theory are presented, in areas such as extremal graph theory, additive number theory, discrete geometry, functional analysis, algorithm design, and in other areas. Most presented problems are easy to understand, but they may be difficult to solve. They can be appreciated on many levels and by a wide readership, ranging from undergraduate students majoring in mathematics to research mathematicians. This collection is an essential reference for mathematicians working in combinatorics and number theory, as well as for computer scientists studying algorithms. ContentsSome definitions and notationsRamsey theoryBi-color diagonal classical Ramsey numbersPaley graphs and lower bounds for R(k, k)Bi-color off-diagonal classical Ramsey numbersMulticolor classical Ramsey numbersGeneralized Ramsey numbersFolkman numbersThe Erdős–Hajnal conjecture Other Ramsey-type problems in graph theory On van der Waerden numbers and Szemeredi’s theorem More problems of Ramsey type in additive number theory Sidon–Ramsey numbers Games in Ramsey theory Local Ramsey theory Set-coloring Ramsey theory Other problems and conjectures
Mode of access: Internet via World Wide Web.
In English.
Description based on online resource; title from PDF title page (publisher's Web site, viewed 30. Aug 2021)
Combinatorial analysis.
Graph theory.
Ramsey theory.
Liang, Meilian, author. aut http://id.loc.gov/vocabulary/relators/aut
Luo, Haipeng, author. aut http://id.loc.gov/vocabulary/relators/aut
University of Science & Technology,.
Xu, Xiaodong, contributor. ctb https://id.loc.gov/vocabulary/relators/ctb
Title is part of eBook package: De Gruyter DG Plus eBook-Package 2018 9783110719550
Title is part of eBook package: De Gruyter EBOOK PACKAGE COMPLETE 2018 English 9783110604252
Title is part of eBook package: De Gruyter EBOOK PACKAGE COMPLETE 2018 9783110603255 ZDB-23-DGG
Title is part of eBook package: De Gruyter EBOOK PACKAGE Mathematics 2018 English 9783110604191
Title is part of eBook package: De Gruyter EBOOK PACKAGE Mathematics 2018 9783110603194 ZDB-23-DMA
EPUB 9783110576634
print 9783110576511
https://doi.org/10.1515/9783110576702
https://www.degruyter.com/isbn/9783110576702
Cover https://www.degruyter.com/cover/covers/9783110576702.jpg
language English
format eBook
author Xu, Xiaodong,
Xu, Xiaodong,
Liang, Meilian,
Luo, Haipeng,
spellingShingle Xu, Xiaodong,
Xu, Xiaodong,
Liang, Meilian,
Luo, Haipeng,
Ramsey Theory : Unsolved Problems and Results /
Frontmatter --
Preface --
Contents --
1. Some Definitions And Notations --
2. Ramsey Theory --
3. Bi-Color Diagonal Classical Ramsey Numbers --
4. Paley Graphs And Lower Bounds For R(K, K) --
5. Bi-Color Off-Diagonal Classical Ramsey Numbers --
6. Multicolor Classical Ramsey Numbers --
7. Generalized Ramsey Numbers --
8. Folkman Numbers --
9. The Erdős–Hajnal Conjecture --
10. Other Ramsey-Type Problems In Graph Theory --
11. On Van Der Waerden Numbers And Szemerédi’S Theorem --
12. More Problems Of Ramsey Type In Additive Number Theory --
13. Sidon–Ramsey Numbers --
14. Games In Ramsey Theory --
15. Local Ramsey Theory --
16. Set-Coloring Ramsey Theory --
17. Other Problems And Conjectures --
Epilogue --
Bibliography --
Index
author_facet Xu, Xiaodong,
Xu, Xiaodong,
Liang, Meilian,
Luo, Haipeng,
Liang, Meilian,
Liang, Meilian,
Luo, Haipeng,
Luo, Haipeng,
University of Science & Technology,.
Xu, Xiaodong,
Xu, Xiaodong,
author_variant x x xx
x x xx
m l ml
h l hl
author_role VerfasserIn
VerfasserIn
VerfasserIn
VerfasserIn
author2 Liang, Meilian,
Liang, Meilian,
Luo, Haipeng,
Luo, Haipeng,
University of Science & Technology,.
Xu, Xiaodong,
Xu, Xiaodong,
author2_variant m l ml
h l hl
o s t u ost ostu
x x xx
x x xx
author2_role VerfasserIn
VerfasserIn
VerfasserIn
VerfasserIn
TeilnehmendeR
MitwirkendeR
MitwirkendeR
author_sort Xu, Xiaodong,
title Ramsey Theory : Unsolved Problems and Results /
title_sub Unsolved Problems and Results /
title_full Ramsey Theory : Unsolved Problems and Results / Xiaodong Xu, Meilian Liang, Haipeng Luo.
title_fullStr Ramsey Theory : Unsolved Problems and Results / Xiaodong Xu, Meilian Liang, Haipeng Luo.
title_full_unstemmed Ramsey Theory : Unsolved Problems and Results / Xiaodong Xu, Meilian Liang, Haipeng Luo.
title_auth Ramsey Theory : Unsolved Problems and Results /
title_alt Frontmatter --
Preface --
Contents --
1. Some Definitions And Notations --
2. Ramsey Theory --
3. Bi-Color Diagonal Classical Ramsey Numbers --
4. Paley Graphs And Lower Bounds For R(K, K) --
5. Bi-Color Off-Diagonal Classical Ramsey Numbers --
6. Multicolor Classical Ramsey Numbers --
7. Generalized Ramsey Numbers --
8. Folkman Numbers --
9. The Erdős–Hajnal Conjecture --
10. Other Ramsey-Type Problems In Graph Theory --
11. On Van Der Waerden Numbers And Szemerédi’S Theorem --
12. More Problems Of Ramsey Type In Additive Number Theory --
13. Sidon–Ramsey Numbers --
14. Games In Ramsey Theory --
15. Local Ramsey Theory --
16. Set-Coloring Ramsey Theory --
17. Other Problems And Conjectures --
Epilogue --
Bibliography --
Index
title_new Ramsey Theory :
title_sort ramsey theory : unsolved problems and results /
publisher De Gruyter,
publishDate 2018
physical 1 online resource (XII, 178 p.)
contents Frontmatter --
Preface --
Contents --
1. Some Definitions And Notations --
2. Ramsey Theory --
3. Bi-Color Diagonal Classical Ramsey Numbers --
4. Paley Graphs And Lower Bounds For R(K, K) --
5. Bi-Color Off-Diagonal Classical Ramsey Numbers --
6. Multicolor Classical Ramsey Numbers --
7. Generalized Ramsey Numbers --
8. Folkman Numbers --
9. The Erdős–Hajnal Conjecture --
10. Other Ramsey-Type Problems In Graph Theory --
11. On Van Der Waerden Numbers And Szemerédi’S Theorem --
12. More Problems Of Ramsey Type In Additive Number Theory --
13. Sidon–Ramsey Numbers --
14. Games In Ramsey Theory --
15. Local Ramsey Theory --
16. Set-Coloring Ramsey Theory --
17. Other Problems And Conjectures --
Epilogue --
Bibliography --
Index
isbn 9783110576702
9783110719550
9783110604252
9783110603255
9783110604191
9783110603194
9783110576634
9783110576511
callnumber-first Q - Science
callnumber-subject QA - Mathematics
callnumber-label QA166
callnumber-sort QA 3166 X865 42018
url https://doi.org/10.1515/9783110576702
https://www.degruyter.com/isbn/9783110576702
https://www.degruyter.com/cover/covers/9783110576702.jpg
illustrated Not Illustrated
dewey-hundreds 500 - Science
dewey-tens 510 - Mathematics
dewey-ones 511 - General principles of mathematics
dewey-full 511/.66
dewey-sort 3511 266
dewey-raw 511/.66
dewey-search 511/.66
doi_str_mv 10.1515/9783110576702
oclc_num 1048948547
work_keys_str_mv AT xuxiaodong ramseytheoryunsolvedproblemsandresults
AT liangmeilian ramseytheoryunsolvedproblemsandresults
AT luohaipeng ramseytheoryunsolvedproblemsandresults
AT universityofsciencetechnology ramseytheoryunsolvedproblemsandresults
status_str n
ids_txt_mv (DE-B1597)489710
(OCoLC)1048948547
carrierType_str_mv cr
hierarchy_parent_title Title is part of eBook package: De Gruyter DG Plus eBook-Package 2018
Title is part of eBook package: De Gruyter EBOOK PACKAGE COMPLETE 2018 English
Title is part of eBook package: De Gruyter EBOOK PACKAGE COMPLETE 2018
Title is part of eBook package: De Gruyter EBOOK PACKAGE Mathematics 2018 English
Title is part of eBook package: De Gruyter EBOOK PACKAGE Mathematics 2018
is_hierarchy_title Ramsey Theory : Unsolved Problems and Results /
container_title Title is part of eBook package: De Gruyter DG Plus eBook-Package 2018
author2_original_writing_str_mv noLinkedField
noLinkedField
noLinkedField
noLinkedField
noLinkedField
noLinkedField
noLinkedField
_version_ 1770177688927993856
fullrecord <?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>05819nam a22008415i 4500</leader><controlfield tag="001">9783110576702</controlfield><controlfield tag="003">DE-B1597</controlfield><controlfield tag="005">20210830012106.0</controlfield><controlfield tag="006">m|||||o||d||||||||</controlfield><controlfield tag="007">cr || ||||||||</controlfield><controlfield tag="008">210830t20182018gw fo d z eng d</controlfield><datafield tag="010" ind1=" " ind2=" "><subfield code="a">2018016483</subfield></datafield><datafield tag="020" ind1=" " ind2=" "><subfield code="a">9783110576702</subfield></datafield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.1515/9783110576702</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-B1597)489710</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(OCoLC)1048948547</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-B1597</subfield><subfield code="b">eng</subfield><subfield code="c">DE-B1597</subfield><subfield code="e">rda</subfield></datafield><datafield tag="041" ind1="0" ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="044" ind1=" " ind2=" "><subfield code="a">gw</subfield><subfield code="c">DE</subfield></datafield><datafield tag="050" ind1="0" ind2="0"><subfield code="a">QA166</subfield><subfield code="b">.X865 2018</subfield></datafield><datafield tag="050" ind1=" " ind2="4"><subfield code="a">QA166</subfield><subfield code="b">.X865 2018</subfield></datafield><datafield tag="082" ind1="0" ind2="4"><subfield code="a">511/.66</subfield><subfield code="2">23</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">Xu, Xiaodong, </subfield><subfield code="e">author.</subfield><subfield code="4">aut</subfield><subfield code="4">http://id.loc.gov/vocabulary/relators/aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Ramsey Theory :</subfield><subfield code="b">Unsolved Problems and Results /</subfield><subfield code="c">Xiaodong Xu, Meilian Liang, Haipeng Luo.</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="a">Berlin ;</subfield><subfield code="a">Boston : </subfield><subfield code="b">De Gruyter, </subfield><subfield code="c">[2018]</subfield></datafield><datafield tag="264" ind1=" " ind2="4"><subfield code="c">©2018</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">1 online resource (XII, 178 p.)</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">computer</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">online resource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="347" ind1=" " ind2=" "><subfield code="a">text file</subfield><subfield code="b">PDF</subfield><subfield code="2">rda</subfield></datafield><datafield tag="505" ind1="0" ind2="0"><subfield code="t">Frontmatter -- </subfield><subfield code="t">Preface -- </subfield><subfield code="t">Contents -- </subfield><subfield code="t">1. Some Definitions And Notations -- </subfield><subfield code="t">2. Ramsey Theory -- </subfield><subfield code="t">3. Bi-Color Diagonal Classical Ramsey Numbers -- </subfield><subfield code="t">4. Paley Graphs And Lower Bounds For R(K, K) -- </subfield><subfield code="t">5. Bi-Color Off-Diagonal Classical Ramsey Numbers -- </subfield><subfield code="t">6. Multicolor Classical Ramsey Numbers -- </subfield><subfield code="t">7. Generalized Ramsey Numbers -- </subfield><subfield code="t">8. Folkman Numbers -- </subfield><subfield code="t">9. The Erdős–Hajnal Conjecture -- </subfield><subfield code="t">10. Other Ramsey-Type Problems In Graph Theory -- </subfield><subfield code="t">11. On Van Der Waerden Numbers And Szemerédi’S Theorem -- </subfield><subfield code="t">12. More Problems Of Ramsey Type In Additive Number Theory -- </subfield><subfield code="t">13. Sidon–Ramsey Numbers -- </subfield><subfield code="t">14. Games In Ramsey Theory -- </subfield><subfield code="t">15. Local Ramsey Theory -- </subfield><subfield code="t">16. Set-Coloring Ramsey Theory -- </subfield><subfield code="t">17. Other Problems And Conjectures -- </subfield><subfield code="t">Epilogue -- </subfield><subfield code="t">Bibliography -- </subfield><subfield code="t">Index</subfield></datafield><datafield tag="506" ind1="0" ind2=" "><subfield code="a">restricted access</subfield><subfield code="u">http://purl.org/coar/access_right/c_16ec</subfield><subfield code="f">online access with authorization</subfield><subfield code="2">star</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Key problems and conjectures have played an important role in promoting the development of Ramsey theory, a field where great progress has been made during the past two decades, with some old problems solved and many new problems proposed. The present book will be helpful to readers who wish to learn about interesting problems in Ramsey theory, to see how they are interconnected, and then to study them in depth. This book is the first problem book of such scope in Ramsey theory. Many unsolved problems, conjectures and related partial results in Ramsey theory are presented, in areas such as extremal graph theory, additive number theory, discrete geometry, functional analysis, algorithm design, and in other areas. Most presented problems are easy to understand, but they may be difficult to solve. They can be appreciated on many levels and by a wide readership, ranging from undergraduate students majoring in mathematics to research mathematicians. This collection is an essential reference for mathematicians working in combinatorics and number theory, as well as for computer scientists studying algorithms. ContentsSome definitions and notationsRamsey theoryBi-color diagonal classical Ramsey numbersPaley graphs and lower bounds for R(k, k)Bi-color off-diagonal classical Ramsey numbersMulticolor classical Ramsey numbersGeneralized Ramsey numbersFolkman numbersThe Erdős–Hajnal conjecture Other Ramsey-type problems in graph theory On van der Waerden numbers and Szemeredi’s theorem More problems of Ramsey type in additive number theory Sidon–Ramsey numbers Games in Ramsey theory Local Ramsey theory Set-coloring Ramsey theory Other problems and conjectures</subfield></datafield><datafield tag="538" ind1=" " ind2=" "><subfield code="a">Mode of access: Internet via World Wide Web.</subfield></datafield><datafield tag="546" ind1=" " ind2=" "><subfield code="a">In English.</subfield></datafield><datafield tag="588" ind1="0" ind2=" "><subfield code="a">Description based on online resource; title from PDF title page (publisher's Web site, viewed 30. Aug 2021)</subfield></datafield><datafield tag="650" ind1=" " ind2="0"><subfield code="a">Combinatorial analysis.</subfield></datafield><datafield tag="650" ind1=" " ind2="0"><subfield code="a">Graph theory.</subfield></datafield><datafield tag="650" ind1=" " ind2="0"><subfield code="a">Ramsey theory.</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Liang, Meilian, </subfield><subfield code="e">author.</subfield><subfield code="4">aut</subfield><subfield code="4">http://id.loc.gov/vocabulary/relators/aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Luo, Haipeng, </subfield><subfield code="e">author.</subfield><subfield code="4">aut</subfield><subfield code="4">http://id.loc.gov/vocabulary/relators/aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">University of Science &amp; Technology,.</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Xu, Xiaodong, </subfield><subfield code="e">contributor.</subfield><subfield code="4">ctb</subfield><subfield code="4">https://id.loc.gov/vocabulary/relators/ctb</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">DG Plus eBook-Package 2018</subfield><subfield code="z">9783110719550</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">EBOOK PACKAGE COMPLETE 2018 English</subfield><subfield code="z">9783110604252</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">EBOOK PACKAGE COMPLETE 2018</subfield><subfield code="z">9783110603255</subfield><subfield code="o">ZDB-23-DGG</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">EBOOK PACKAGE Mathematics 2018 English</subfield><subfield code="z">9783110604191</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">EBOOK PACKAGE Mathematics 2018</subfield><subfield code="z">9783110603194</subfield><subfield code="o">ZDB-23-DMA</subfield></datafield><datafield tag="776" ind1="0" ind2=" "><subfield code="c">EPUB</subfield><subfield code="z">9783110576634</subfield></datafield><datafield tag="776" ind1="0" ind2=" "><subfield code="c">print</subfield><subfield code="z">9783110576511</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">https://doi.org/10.1515/9783110576702</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">https://www.degruyter.com/isbn/9783110576702</subfield></datafield><datafield tag="856" ind1="4" ind2="2"><subfield code="3">Cover</subfield><subfield code="u">https://www.degruyter.com/cover/covers/9783110576702.jpg</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">978-3-11-060419-1 EBOOK PACKAGE Mathematics 2018 English</subfield><subfield code="b">2018</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">978-3-11-060425-2 EBOOK PACKAGE COMPLETE 2018 English</subfield><subfield code="b">2018</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">978-3-11-071955-0 DG Plus eBook-Package 2018</subfield><subfield code="b">2018</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_BACKALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_CL_MTPY</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_DGALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_EBACKALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_EBKALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_ECL_MTPY</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_EEBKALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_ESTMALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_STMALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV-deGruyter-alles</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">PDA12STME</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">PDA13ENGE</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">PDA18STMEE</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">PDA5EBK</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-23-DGG</subfield><subfield code="b">2017</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-23-DMA</subfield><subfield code="b">2018</subfield></datafield></record></collection>